Figure 2. Summary of objective refractive error (including normalized spherical error) obtained by retinoscopy in oculocutaneous albinism (OCA) and ocular albinism (OA) patients. A: Open symbols denote patients with identified sequence changes on both alleles; closed symbols denote patients with identified sequence changes on a single allele only. B: Patients without identified variants. Single patients are presented with follow-up data.